CN103281151A - Wavelength division multiplexing-based photoelectric device - Google Patents

Wavelength division multiplexing-based photoelectric device Download PDF

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Publication number
CN103281151A
CN103281151A CN2013102000088A CN201310200008A CN103281151A CN 103281151 A CN103281151 A CN 103281151A CN 2013102000088 A CN2013102000088 A CN 2013102000088A CN 201310200008 A CN201310200008 A CN 201310200008A CN 103281151 A CN103281151 A CN 103281151A
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optical
fiber
wdm filter
collimater
tail
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CN2013102000088A
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CN103281151B (en
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邹翔
宋琛
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Hisense Broadband Multimedia Technology Co Ltd
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Hisense Broadband Multimedia Technology Co Ltd
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Abstract

The invention discloses a wavelength division multiplexing-based photoelectric device, which comprises a detector, a reflection device, a WDM (wavelength division multiplexing) optical filter, a collimator, a double fiber-tip device and a WDM optical filter pipe body, wherein the WDM optical filter is internally installed on a support in the WDM optical filter pipe body; above the internally installed WDM optical filter, the reflection device is fixedly arranged at the upper part of the WDM optical filter pipe body through an insulating material; along the direction of the optical axis of the detector, the detector is fixedly arranged at one side of the WDM optical filter pipe body through the insulating material; the other side of the WDM optical filter pipe body is fixedly provided with the collimator; and the other side of the collimator fixed to the WDM optical filter pipe body is fixedly provided with the double fiber-tip device. By applying the WDM-based photoelectric device disclosed by the invention, the time required by regulation can be shortened, and the regulation efficiency can be improved.

Description

Electrooptical device based on wavelength division multiplexing
Technical field
The present invention relates to optical communication field, relate in particular to a kind of electrooptical device based on wavelength division multiplexing.
Background technology
In recent years, insert based on the optical fiber of optical fiber communication that (FTTx Fiber-to-the-x) waits the broadband network that voice, data and the Video service of high speed can be provided for the user, has obtained fast development.In the existing broadband network, still do not support cable TV (CATV, Community Antenna Television) business.Thereby, in order to expand the application function of broadband network, need upgrade to existing broadband network, so that it supports the CATV business, should few as far as possible legacy network be changed simultaneously.
Existing upgrading mode commonly used is the local side at optical-fiber network, for example, optical line terminal (the OLT of optical-fiber network end, Optical Line Terminal) carries out the broadcasting of CATV signal, and at user side optical network unit (ONU, Optical Network Unit) in the electrooptical device, the photoelectric component that receives the CATV signal is set.
Fig. 1 is existing electrooptical device structural representation based on wavelength division multiplexing.Referring to Fig. 1, this electrooptical device comprises: detector 1, shell 2, wavelength division multiplexer (WDM, Wavelength Division Multiplexing) filter 3, collimater 4 and double tail fiber device 5, wherein, shell 2 is built-in with the part of WDM filter 3, collimater 4 and double tail fiber device 5, and the external diameter of shell 2 is close with detector 1 size.
The light signal first transmitting-receiving port 6(first tail optical fiber in the double tail fiber device 5) receives the uplink optical signal that outside ONU sends, uplink optical signal is non-CATV signal, export collimater 4 to, by collimater 4 collimate handle after, obtain up collimation (parallel) light, up collimated light exports WDM filter 3 to, the up collimated light reflection that WDM filter 3 will receive, export collimater 4 to, collimater 4 collimates after (converging) processing again, export the light signal second transmitting-receiving port 7 in the double tail fiber device 5 to, and by the light signal second transmitting-receiving port 7(second tail optical fiber in the double tail fiber device 5) export the optical-fiber network end to, finally be transferred to the OLT of optical network local side.
The downlink optical signal of optical-fiber network end transmission, comprise CATV signal and non-CATV signal, export the light signal second transmitting-receiving port 7 in the double tail fiber device 5 to, the light signal second transmitting-receiving port 7 in the double tail fiber device 5 receives the downlink optical signal that outside OLT sends, export collimater 4 to, by collimater 4 collimate handle after, obtain descending collimated light, descending collimated light exports WDM filter 3 to.Wherein,
For non-CATV signal, WDM filter 3 exports the collimated light reflection that receives to collimater 4, after the processing that collimates again, export the light signal first transmitting-receiving port 6 in the double tail fiber device 5 to, and export user side ONU to by the light signal first transmitting-receiving port 6 in the double tail fiber device 5.
For the CATV signal, WDM filter 3 carries out transmission with the collimated light that receives, and exports detector 1 to, and the CATV light signal that detector 1 receives through 3 transmissions of WDM filter changes the signal of telecommunication into after the processing, export user side to from pin.
3 pairs of CATV signals of WDM filter carry out transmission, and non-CATV signal is reflected or total reflection, can different anti-reflection films be set realize according to the wavelength characteristics of CATV signal and non-CATV signal.In the practical application, WDM filter 3 initially can be installed in the shell 2, then, setting angle by fine setting WDM filter 3, thereby realize the CATV signal is carried out transmission, non-CATV signal is reflected or total reflection, and feasible light signal through collimater 4 convergence processing can converge at the corresponding tail optical fiber in the double tail fiber device 5.
By as seen above-mentioned, existing electrooptical device based on wavelength division multiplexing, the shell size is subjected to the assembling restriction, and external diameter and detector are suitable, and consider the requirement of mechanical strength of electrooptical device, and the tube wall of shell can not be too thin, and therefore, the shell internal diameter size is very limited; Further, be subjected to the double tail fiber collimater and penetrate the restriction of the signal spot size that comes, WDM filter size can not be too small, make limited space in shell, by regulating the setting angle of WDM filter, the adjusting surplus is limited, and angular adjustment is very difficult, and the angular adjustment required time is long, adjusting efficient is low.
Summary of the invention
Embodiments of the invention provide a kind of electrooptical device based on wavelength division multiplexing, reduce and regulate required time, raising adjusting efficient.
For achieving the above object, a kind of electrooptical device based on wavelength division multiplexing that the embodiment of the invention provides, this electrooptical device comprises: detector, reflection device, WDM filter, collimater, double tail fiber device and WDM filter body, wherein,
The WDM filter is built on the interior support of WDM filter body, and above built-in WDM filter, reflection device is fixed on WDM filter body top by insulating material; Along the detector optical axis direction, detector is fixed on a side of WDM filter body by insulating material, and the opposite side of WDM filter body fixedly has collimater, with the opposite side of the fixing collimater of WDM filter body, the double tail fiber device is fixedly arranged.
Preferably, on optical axis direction, the optical axis of described detector and the optical axis of collimater are on same straight line.
Preferably, described collimater is lens or set of lenses, and the fibre core of two tail optical fibers of described double tail fiber device is positioned on the focal plane of lens.
Preferably, described collimater and double tail fiber device are combined as the optical interface device, as the public input/output end port of electrooptical device, adopt SC plug-type or LC plug-type, perhaps, adopt SC/PC tail fiber type, SC/APC tail fiber type or LC/APC type.
Preferably, described reflection device comprises: level crossing, radius of curvature greater than the concave mirror that sets in advance the radius threshold value and radius of curvature greater than the convex mirror that sets in advance the radius threshold value.
Preferably, described WDM optical filter coating face is towards collimater and reflection device, and non-plated film face is towards detector, and the angular range between non-plated film face and the detector optical axis is 38 °~52 °.
Preferably, the angular range between the normal of described reflection device and the collimater optical axis is 83 °~97 °.
Preferably, described detector is indium gallium arsenic fast photodiode detector or avalanche photodide detector.
Preferably, first tail optical fiber in the double tail fiber device receives the uplink optical signal that outside optical network unit ONU is sent, and transmission comes from downlink optical signal optical-fiber network, the described electrooptical device of process to ONU;
Second tail optical fiber in the double tail fiber device receives the downlink optical signal that comes from optical-fiber network, and transmission comes from uplink optical signal optical network unit ONU, the described electrooptical device of process to optical-fiber network;
Detector receives the CATV signal that comes from optical-fiber network, is converted into the signal of telecommunication, exports from pin.
Preferably, first tail optical fiber in the double tail fiber device receives the uplink optical signal that outside optical network unit ONU is sent, export collimater to, collimating by collimater exports the WDM filter to after handling, and the WDM filter reflexes to reflection device, and reflection device is reflected back WDM filter again, the WDM filter reflects again, export collimater to and converge, export second tail optical fiber in the double tail fiber device to, and export the optical-fiber network end to by second tail optical fiber in the double tail fiber device;
The downlink optical signal of optical-fiber network end transmission exports second tail optical fiber in the double tail fiber device to, exports collimater then to, exports the WDM filter after collimater collimates and handles to:
For non-CATV signal, the WDM filter reflexes to reflection device, and reflection device is reflected back WDM filter again, the WDM filter reflects again, export collimater to and converge, export first tail optical fiber in the double tail fiber device to, and export ONU to by first tail optical fiber in the double tail fiber device;
For the CATV signal, the WDM filter carries out transmission, exports detector to, and detector receives the CATV light signal through the transmission of WDM filter, changes the signal of telecommunication after the processing into, exports user side to from pin.
As seen from the above technical solution, a kind of electrooptical device based on wavelength division multiplexing that the embodiment of the invention provides, WDM filter, reflection device and collimater are set to independently element, and above the WDM filter, reflection device is set, in order to carry out the adjusting of reflection ray, make the reflection device that needs to regulate regulate the space increase, reduce and regulate the required time; That is to say, the adjusting space that the accommodation reflex device has in this patent, more loose than the adjusting space that the WDM filter of prior art scheme has, thus making to regulate becomes comparatively easy.Simultaneously, because the WDM filter has had bigger installing space, more convenient to operate during assembling.
Description of drawings
In order to be illustrated more clearly in the present invention or technical scheme of the prior art, below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art.Apparently, the accompanying drawing in below describing only is some embodiments of the present invention, for those of ordinary skills, can also obtain other embodiment and accompanying drawing thereof according to these accompanying drawing illustrated embodiments.
Fig. 1 is existing electrooptical device structural representation based on wavelength division multiplexing.
Fig. 2 is that the embodiment of the invention is based on the electrooptical device structural representation of wavelength division multiplexing.
Fig. 3 is that the embodiment of the invention is based on the electrooptical device sectional structure schematic diagram of wavelength division multiplexing.
Embodiment
Below with reference to accompanying drawing technical scheme of the present invention is carried out clear, complete description, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are resulting all other embodiment under the prerequisite of not making creative work, all belong to the scope that the present invention protects.
Existing electrooptical device based on wavelength division multiplexing because the shell internal diameter size is limited, is regulated the setting angle of WDM filter in shell, the angular adjustment difficulty, and required time is long, adjusting efficient is low.
The setting angle of considering the WDM filter needs and can carry out transmission to the CATV signal, non-CATV signal is reflected, feasible adjusting is difficulty comparatively, in the embodiment of the invention, WDM filter and collimater are set to independently element, are about to WDM filter and collimater and are not built in the shell, and above the WDM filter, reflection device is set, in order to carry out the adjusting of reflection ray, make the reflection device that needs to regulate regulate the space increase, reduce and regulate the required time; That is to say, the adjusting space that the accommodation reflex device has in this patent, more loose than the adjusting space that the WDM filter of prior art scheme has, thus making to regulate becomes comparatively easy.Simultaneously, because the WDM filter has had bigger installing space, more convenient to operate during assembling.
Fig. 2 is that the embodiment of the invention is based on the electrooptical device structural representation of wavelength division multiplexing.Referring to Fig. 2, this electrooptical device comprises: detector 21, reflection device 22, WDM filter 23, collimater 24, double tail fiber device 25 and WDM filter body 26, wherein,
WDM filter 23 is built on the support in the WDM filter body 26, and above built-in WDM filter 23, reflection device 22 is fixed on WDM filter body 26 tops by insulating material; Along detector optical axis (radially) direction, detector 21 is fixed on a side of WDM filter body 26 by insulating material, and the opposite side of WDM filter body 26 fixedly has collimater 24, with the opposite side of the fixing collimater 24 of WDM filter body 26, double tail fiber device 25 is fixedly arranged.
In the embodiment of the invention, be provided with two fibre cores in the double tail fiber device 25, handle by bifurcated, outside or inner at double tail fiber device 25, form two tail optical fibers that have tail wires of fiber optics, tail optical fiber is connected with user side (ONU) with exterior light network terminal (finally being connected to optical network local side OLT) respectively.Wherein, crotch can be arranged on the end of double tail fiber device 25, namely with the interface of outside, also can be arranged on the inside of double tail fiber device 25, and namely tail optical fiber stretches in the double tail fiber device 25, by bifurcated, forms two fibre cores.Preferably, the end face of fibre core is positioned on the focal plane of collimater 24 in the double tail fiber device 25.
In the practical application, the optical interface device is as the public input/output end port of electrooptical device, can adopt plug-in square (SC) plug-type or plug-in round (LC) plug-type, perhaps, adopt plug-in square/microballoon face grinding and polishing (SC/PC) tail fiber type, plug-in square/be the oblique angle and do microballoon face grinding and polishing (SC/APC) tail fiber type or plug-in round/be the oblique angle and make microballoon face grinding and polishing (LC/APC) type, to be connected with the light mouth of external network, realize the single fiber bi-directional transfer function.
Preferably, detector can be that (PIN, Positive-intrinsic-Negtive) detector also can be avalanche photodide (APD, Avalanche Photo Diode) detectors to indium gallium arsenic fast photodiode.
Preferably; WDM filter body is hexahedral shape; institute it should be noted that; it is exemplary that WDM filter body adopts hexahedral shape; the optical axis of every optical axis (radial direction) that can make detector and collimater 24 is on same straight line; and can be respectively fixedly WDM filter and reflection device, and the shape that makes reflection device be positioned at WDM filter upper end all falls within the scope of protection of the present invention.
In the practical application, before detector 21 is fixed on a side of WDM filter body 26 by insulating material 28, can position detector 21: after WDM filter 23 is installed according to the angle that sets in advance, insert outside CATV signal by double tail fiber device 25, export collimater 24 to, after the CATV signal of 24 pairs of receptions of collimater collimates and handles, obtain directional light, export WDM filter 23 to, 23 pairs of CATV signals of WDM filter carry out transmission, export detector 21 to, by fine adjustment detector 21, the CATV light signal that makes detector 21 receive reaches the strongest, then, and fixed detector 21.In the embodiment of the invention; be exemplary by insulating material with the fixed form that detector 21 is fixed on WDM filter body 26 1 sides; every fixed form and immobilization material that detector 21 can be fixed on WDM filter body 26 1 sides all falls into protection scope of the present invention.
In the embodiment of the invention, reflection device 22 is fixed on WDM filter body 26 tops by insulating material 29, before fixing, can position reflection device 22: after WDM filter 23 is installed according to the angle that sets in advance, insert outside non-CATV signal by the arbitrary tail optical fiber in the double tail fiber device 25, export collimater 24 to, after the non-CATV signal of 24 pairs of receptions of collimater collimates and handles, obtain directional light, export WDM filter 23 to, 23 pairs of non-CATV signals of WDM filter reflect, export the reflection device 22 on top to, the non-CATV signal that reflection device 22 reflections receive, reflex to WDM filter 23, WDM filter 23 carries out secondary reflection again, and collimater 24 is returned in the non-CATV signal reflex that receives, the non-CATV signal of 24 pairs of receptions of collimater carries out convergence processing, converges to another root tail optical fiber in the double tail fiber device 25.Setting angle by fine setting reflection device 22, can change the position that non-CATV signal converges in collimater 24 left end focal planes, can make the non-CATV signal gathering that converges on fibre core, make and pass through the non-CATV signal that the arbitrary tail optical fiber in the double tail fiber device 25 is imported, can be received by another root tail optical fiber in the double tail fiber device 25, the non-CATV light signal that namely makes another root tail optical fiber in the double tail fiber device 25 receive reaches the strongest, then, and fixation reflex device 22.In the embodiment of the invention; adopting insulating material is exemplary with the fixed form that reflection device 22 is fixed on WDM filter body 26 tops; every fixed form and immobilization material that reflection device 22 can be fixed on WDM filter body 26 tops all falls into protection scope of the present invention.By adjusting reflection device 22, make downlink optical signal transfer to the ONU end via fibre core 10.
In the practical application, also collimater 24 and double tail fiber device 25 can be set to one, be about to double tail fiber device 25 and place in the collimater 24, form optical interface device 27, the transmitting optical signal that is used for the outside is imported in the single-mode tail fiber is transformed into collimated light, it is directional light, and, will reflect the collimated light that obtains from the WDM filter, carry out convergence processing, be coupled in another single-mode tail fiber, with outside transmission.
In the embodiment of the invention, electrooptical device both can be applied to ethernet passive optical network (EPON, Ethernet Passive Optical Network) system, also can be applied to gigabit passive optical network (GPON, Gigabit Passive Optical Network) system, optical network unit (ONU, Optical Network Unit) Shu Chu uplink optical signal wavelength is 1310nm, the wavelength of the non-CATV light signal in the downlink optical signal of OLT output is 1490nm, and the wavelength of the CATV signal in the downlink optical signal is 1550nm.The CATV signal of WDM filter 23 transmission 1550nm, the uplink optical signal of reflection 1310nm and the downlink optical signal of 1490nm.
Preferably, the light signal of 23 couples of 1260~1360nm of WDM filter and 1480~1500nm has good total reflection characteristic; CATV light signal to 1550~1560nm has good transmissison characteristic.
Structure and workflow thereof about detector 21, WDM filter 23, collimater 24 and double tail fiber device 25 are prior art, omit detailed description at this.
Fig. 3 is that the embodiment of the invention is based on the electrooptical device sectional structure schematic diagram of wavelength division multiplexing.Referring to Fig. 3, this electrooptical device of analysing and observe comprises: detector 21, reflection device 22, WDM filter 23 and optical interface device 27, wherein,
On optical axis direction, detector 21 is positioned at the left side of optical interface device 27, the optical axis of the optical axis of detector 21 and optical interface device 27 is on same straight line, detector 21 is used for receiving from the next CATV light signal of WDM filter 23 transmissions, and after the CATV light signal that receives is converted into the signal of telecommunication, insert in the external circuits through the pin of detector 21;
Optical interface device 27 has two tail optical fibers, be respectively first tail optical fiber and second tail optical fiber, two tail optical fibers are on optical interface device 27 internal ports, be used for connecting outside optical-fiber network end and user side, receive the uplink optical signal that user side is exported by first tail optical fiber, handle through collimation, export WDM filter 23 to, receive WDM filter 23 uplink optical signals through the reflection device reflected back, handle through collimation, export the optical-fiber network end to by second tail optical fiber; Receive the downlink optical signal that the optical-fiber network end is exported by second tail optical fiber, handle through collimation, export WDM filter 23 to, receive WDM filter 23 downlink optical signals through the reflection device reflected back, the process collimation is handled, and exports user side to by first tail optical fiber;
In the embodiment of the invention, collimater in the optical interface device 27 adopts lens or set of lenses, the fibre core of two tail optical fibers in the optical interface device 27 apart can be very near at close lens place, thereby can share a ceramic sheath, and the fibre core of first tail optical fiber and second tail optical fiber all is positioned on the focal plane of lens.Like this, by the up and downlink optical signal of first tail optical fiber and the transmission of second tail optical fiber, after the collimation processing through lens, become parallel optical signal, directive WDM filter 23; And by the light signal of WDM filter 23 reflection, through the reflection of reflection device 22 and the reflection again of WDM filter 23, still be directional light, through after the focusing of lens, converge at respectively on the fibre core end face of second tail optical fiber or first tail optical fiber, export the outside to by second tail optical fiber or first tail optical fiber then.Enter the CATV light signal of device by second tail optical fiber, become directional light through behind the lens, directive WDM filter 23 is projected to detector 21 by WDM filter 23, is converted into the signal of telecommunication by detector 21, and outputs to the outside from the pin of detector 21.
In the embodiment of the invention, by adjusting reflection device 22, can change light signal in the position that lens focal plane converges, can make on its fibre core that converges in first tail optical fiber or second tail optical fiber.
WDM filter 23 is between detector 21 and optical interface device 27, and the plated film face is towards collimater 24 and reflection device 22, and non-plated film face is towards detector 21.Setting angle, namely the angle between non-plated film face and detector 21 optical axises is α.The plated film face is for separating of non-CATV signal and CATV signal: behind the uplink optical signal or the non-CATV signal in the downlink optical signal that receive 27 outputs of optical interface device, reflex to reflection device 22, after reflection device 22 reflections, again directive WDM filter 23, WDM filter 23 receives the light signal that reflection device 22 returns, through secondary reflection again, export optical interface device 27 to; Behind the CATV signal in the downlink optical signal that receives 27 outputs of optical interface device, be transmitted through detector 21;
In the embodiment of the invention, WDM filter 23 has the complete transmission of CATV light signal, the characteristic that non-CATV light signal is reflected fully.
Reflection device 22 is positioned at the upper end of WDM filter 23, and the angle between the normal of reflection device 22 and optical interface device 27 optical axises is β.Reflection device is used for reflection by the non-CATV signal of WDM filter 23 outputs, and reflexes to WDM filter 23.
Preferably, reflection device 22 can be level crossing, also can be that radius of curvature is greater than the concave mirror that sets in advance the radius threshold value or convex mirror.The setting of radius threshold value if the collimated light beam diameter that guarantees to obtain by 23 reflections of WDM filter less than 3mm.
Preferably, the span of α is 38 °~52 °, and the span of β is 83 °~97 °.
Below the workflow of the embodiment of the invention based on the electrooptical device of wavelength division multiplexing is described in detail.
First tail optical fiber in the double tail fiber device 25 receives the uplink optical signal that outside ONU sends, uplink optical signal is non-CATV signal, export collimater 24 to, by collimater 24 collimate handle after, obtain up collimation (parallel) light, up collimated light exports WDM filter 23 to, the up collimated light that WDM filter 23 will receive reflexes to reflection device 22, the up collimated light that reflection device 22 will receive is reflected back WDM filter 23 again, the up collimated light of 23 pairs of receptions of WDM filter reflects again, export collimater 24 to, after collimater 24 collimates again and handles, export second tail optical fiber in the double tail fiber device 25 to, and export the optical-fiber network end to by second tail optical fiber in the double tail fiber device 25, finally arrive optical network local side OLT;
The downlink optical signal of optical-fiber network end (coming from optical network local side OLT transmission) transmission, comprise CATV signal and non-CATV signal, export second tail optical fiber in the double tail fiber device 25 to, second tail optical fiber in the double tail fiber device 25 receives the downlink optical signal that outside OLT sends, export collimater 24 to, by collimater 24 collimate handle after, obtain descending collimated light, descending collimated light exports WDM filter 3 to.Wherein,
For non-CATV signal, the descending collimated light that WDM filter 23 will receive reflexes to reflection device 22, the descending collimated light that reflection device 22 will receive is reflected back WDM filter 23 again, the descending collimated light of 23 pairs of receptions of WDM filter reflects again, export collimater 24 to, collimater 24 exports first tail optical fiber in the double tail fiber device 25 to, and exports user side ONU to by first tail optical fiber in the double tail fiber device 25 after collimating again and handling.
For the CATV signal, the descending collimated light that WDM filter 23 will receive carries out transmission, exports detector 21 to, and the CATV light signal that detector 21 receives through 23 transmissions of WDM filter changes the signal of telecommunication into after the processing, export user side to from pin.
By as seen above-mentioned, in the embodiment of the invention, WDM filter, reflection device and collimater are set to independently element, increased the fixedly space of WDM filter, thereby make easy operating when installing and fixing the WDM filter, and above the WDM filter, reflection device is set, in order to carry out the adjusting of reflection ray, make the reflection device that needs to regulate regulate the space increase, reduce and regulate the required time; That is to say, the adjusting space that the accommodation reflex device has in this patent, more loose than the adjusting space that the WDM filter of prior art scheme has, thus making to regulate becomes comparatively easy.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also comprises these changes and modification interior.

Claims (10)

1. the electrooptical device based on wave division multiplexing WDM is characterized in that, this electrooptical device comprises: detector, reflection device, WDM filter, collimater, double tail fiber device and WDM filter body, wherein,
The WDM filter is built on the interior support of WDM filter body, and above built-in WDM filter, reflection device is fixed on WDM filter body top by insulating material; Along the detector optical axis direction, detector is fixed on a side of WDM filter body by insulating material, and the opposite side of WDM filter body fixedly has collimater, with the opposite side of the fixing collimater of WDM filter body, the double tail fiber device is fixedly arranged.
2. electrooptical device according to claim 1 is characterized in that, on optical axis direction, the optical axis of described detector and the optical axis of collimater are on same straight line.
3. electrooptical device according to claim 2 is characterized in that, described collimater is lens or set of lenses, and the fibre core of two tail optical fibers of described double tail fiber device is positioned on the focal plane of lens.
4. electrooptical device according to claim 3 is characterized in that, described collimater and double tail fiber device are combined as the optical interface device, public input/output end port as electrooptical device, adopt SC plug-type or LC plug-type, perhaps, adopt SC/PC tail fiber type, SC/APC tail fiber type or LC/APC type.
5. according to each described electrooptical device of claim 1 to 4, it is characterized in that described reflection device comprises: level crossing, radius of curvature greater than the concave mirror that sets in advance the radius threshold value and radius of curvature greater than the convex mirror that sets in advance the radius threshold value.
6. electrooptical device according to claim 5 is characterized in that, described WDM optical filter coating face is towards collimater and reflection device, and non-plated film face is towards detector, and the angular range between non-plated film face and the detector optical axis is 38 °~52 °.
7. electrooptical device according to claim 6 is characterized in that, the angular range between the normal of described reflection device and the collimater optical axis is 83 °~97 °.
8. electrooptical device according to claim 5 is characterized in that, described detector is indium gallium arsenic fast photodiode detector or avalanche photodide detector.
9. electrooptical device according to claim 5 is characterized in that,
First tail optical fiber in the double tail fiber device receives the uplink optical signal that outside optical network unit ONU is sent, and transmission comes from downlink optical signal optical-fiber network, the described electrooptical device of process to ONU;
Second tail optical fiber in the double tail fiber device receives the downlink optical signal that comes from optical-fiber network, and transmission comes from uplink optical signal optical network unit ONU, the described electrooptical device of process to optical-fiber network;
Detector receives the CATV signal that comes from optical-fiber network, is converted into the signal of telecommunication, exports from pin.
10. electrooptical device according to claim 9 is characterized in that,
First tail optical fiber in the double tail fiber device receives the uplink optical signal that outside optical network unit ONU is sent, export collimater to, collimate by collimater and to export the WDM filter to after handling, the WDM filter reflexes to reflection device, reflection device is reflected back WDM filter again, and the WDM filter reflects again, exports collimater to and converges, export second tail optical fiber in the double tail fiber device to, and export the optical-fiber network end to by second tail optical fiber in the double tail fiber device;
The downlink optical signal of optical-fiber network end transmission exports second tail optical fiber in the double tail fiber device to, exports collimater then to, exports the WDM filter after collimater collimates and handles to:
For non-CATV signal, the WDM filter reflexes to reflection device, and reflection device is reflected back WDM filter again, the WDM filter reflects again, export collimater to and converge, export first tail optical fiber in the double tail fiber device to, and export ONU to by first tail optical fiber in the double tail fiber device;
For the CATV signal, the WDM filter carries out transmission, exports detector to, and detector receives the CATV light signal through the transmission of WDM filter, changes the signal of telecommunication after the processing into, exports user side to from pin.
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CN1447141A (en) * 2002-03-27 2003-10-08 松下电器产业株式会社 Photo complexing assembly, lightwave length complexer/decomplexer and mfg. method of photo complexing assembly
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